Non-aqueous coolant composition and cooling system

Abstract

The present invention aims to provide a non-aqueous coolant composition having excellent insulation and improved heat transfer characteristics. The present embodiment is a non-aqueous coolant composition, which contains at least one amine compound as a non-aqueous base, and the amine compound is at least one selected from aliphatic amine compounds, aromatic amine compounds, alkanolamine compounds, amide amine compounds, amine oxide compounds, heterocyclic amine compounds, and ether amine compounds.

Description

Technical Field

[0001] The present invention relates to a non-aqueous coolant composition and a cooling system using the non-aqueous coolant composition. Background Art

[0002] Cars with a driving motor, such as hybrid cars and electric cars, are equipped with a power control unit (PCU) for properly controlling electric power. The PCU includes an inverter for driving the motor, a boost converter for controlling the voltage, a DCDC converter for stepping down the high voltage, and the like. The inverter or converter has a power card, which is a card-type power module with built-in semiconductor components, and the power card generates heat as the switch is operated. Therefore, the inverter and converter are devices that can generate heat to high temperatures. In addition, as a heat generating device in a car with a driving motor, in addition to the inverter and converter, a battery can be listed. Therefore, a cooling system for cooling the inverter, converter, battery, and the like is provided in a car with a driving motor.

[0003] For example, Patent Document 1 describes a structure of a semiconductor device used in an inverter of a drive system of a vehicle (eg, an electric vehicle or a hybrid vehicle) having a driving motor ( Figure 1 ). Figure 1 The semiconductor device 2 is a unit formed by stacking a plurality of power cards 10 and a plurality of coolers 3. Figure 1 In the figure, only one power card is marked with the mark 10, and the other power cards are omitted. In addition, in order to see the entire semiconductor device 2, the housing 31 that accommodates the semiconductor device 2 is depicted with a dotted line. One power card 10 is sandwiched between two coolers 3. An insulating plate 6a is sandwiched between the power card 10 and the other cooler 3, and an insulating plate 6b is sandwiched between the power card 10 and the other cooler 3. Grease is applied between the power card 10 and the insulating plates 6a, 6b. Grease is also applied between the insulating plates 6a, 6b and the coolers 3. To explain, Figure 1 For ease of understanding, one power card 10 and insulating plates 6a, 6b are drawn out of the semiconductor device 2. The power card 10 contains semiconductor elements. The power card 10 is cooled by a refrigerant passing through the cooler 3. The refrigerant is a liquid, typically water. The power card 10 and the cooler 3 are alternately stacked, and the cooler 3 is located at both ends of the stacking direction of the unit. Multiple coolers 3 are connected by connecting pipes 5a, 5b. The refrigerant supply pipe 4a and the refrigerant discharge pipe 4b are connected to the cooler 3 located at one end of the stacking direction of the unit. The refrigerant supplied through the refrigerant supply pipe 4a is distributed to all the coolers 3 through the connecting pipe 5a. The refrigerant absorbs heat from the adjacent power card 10 while passing through each cooler 3. The refrigerant that has passed through each cooler 3 is discharged from the refrigerant discharge pipe 4b through the connecting pipe 5b.

[0004] As the coolant, non-aqueous coolants such as mineral oil, aqueous coolants containing water (e.g., a mixture of ethylene glycol and water), etc. are generally used. For example, Patent Document 2 discloses a coolant composition containing (A) a polyol; (B) water; (C) cyclohexanol; and (D) a nonionic surfactant represented by a prescribed formula and having an HLB value of 11.0 or more as an aqueous coolant. Aqueous coolants generally have excellent cooling performance.

[0005] [Prior art literature]

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2017-017228

[0008] Patent Document 2: Japanese Patent Application Publication No. 2020-026471 Summary of the invention

[0009] Technical issues to be solved by the invention

[0010] As shown in the structure of the semiconductor device shown in Patent Document 1, the coolant usually circulates near the power card or the battery. Therefore, in a hybrid car or electric car equipped with a driving motor, if the coolant leaks due to an accident, the leaked coolant may contact the terminals of the power card or the battery, causing a short circuit. Therefore, from the perspective of preventing such a secondary disaster from occurring even in the event of a coolant leak, the coolant requires excellent insulation. In this regard, water-based cooling such as a mixture of ethylene glycol and water or a composition described in Patent Document 2, which is commonly used, has high conductivity and poor insulation. On the other hand, non-aqueous coolants such as mineral oil have excellent insulation. However, non-aqueous coolants such as mineral oil have room for improvement in cooling performance, i.e., heat transfer characteristics.

[0011] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a non-aqueous coolant composition having excellent insulating properties and improved heat transfer characteristics.

[0012] Means for solving problems

[0013] Examples of this embodiment are described below.

[0014] (1) A non-aqueous coolant composition comprising at least one amine compound as a non-aqueous base, wherein the amine compound is at least one selected from aliphatic amine compounds, aromatic amine compounds, alkanolamine compounds, amide amine compounds, amine oxide compounds, heterocyclic amine compounds, and ether amine compounds.

[0015] (2) The nonaqueous coolant composition according to (1), wherein the amine compound is an aliphatic amine compound.

[0016] (3) The non-aqueous coolant composition according to (2), wherein the aliphatic amine compound is NR 1 R 2 R 3 [Where R 1 C6~C 24 Alkyl, R 2 and R 3 Each independently represents a hydrogen atom or a C1-C4 alkyl group].

[0017] (4) The non-aqueous coolant composition R according to (3) 1 C8~C 20 alkyl.

[0018] (5) The non-aqueous coolant composition according to (3) or (4), wherein R 2 and R 3 Each is independently a C1-C3 alkyl group.

[0019] (6) The nonaqueous coolant composition according to any one of (1) to (5), wherein the content of the amine compound is 10% by mass or more.

[0020] (7) The nonaqueous coolant composition according to any one of (1) to (6), further comprising at least one base oil selected from mineral oils and synthetic oils.

[0021] (8) The nonaqueous coolant composition according to (7), wherein the content of the amine compound is 10 to 90% by mass; and the content of the base oil is 10 to 90% by mass.

[0022] (9) The nonaqueous coolant composition according to (7), wherein the content of the amine compound is 30 to 70% by mass and the content of the base oil is 30 to 70% by mass.

[0023] (10) The nonaqueous coolant composition according to any one of (7) to (9), wherein the total content of the amine compound and the base oil is 80 to 100% by mass.

[0024] (11) The nonaqueous coolant composition according to any one of (1) to (10), wherein the electrical conductivity at 20°C is 0.1 μS / cm or less.

[0025] (12) A cooling system using the nonaqueous coolant composition according to any one of (1) to (11) as a refrigerant.

[0026] (13) The cooling system according to (12), which is used to cool a heat-generating device mounted on a vehicle having a driving motor.

[0027] (14) The cooling system according to (13), wherein the heat generating device is an inverter, a converter, a generator, a motor, or a battery.

[0028] (15) The cooling system according to (13) or (14), wherein the heat generating device has a power card, and the coolant composition is in physical contact with the power card.

[0029] Effects of the Invention

[0030] According to the present invention, a non-aqueous coolant composition having excellent insulation properties and improved heat transfer characteristics can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic perspective view showing a configuration example of a semiconductor device used in an inverter of a drive system of an automobile including a driving motor.

[0032] Explanation of symbols

[0033] 2: Semiconductor devices

[0034] 3: Cooler

[0035] 4a: Refrigerant supply pipe

[0036] 4b: Refrigerant discharge pipe

[0037] 5a, 5b: Connecting pipe

[0038] 6a, 6b: Insulation board

[0039] 10: Power card

[0040] 31: Shell DETAILED DESCRIPTION

[0041] The present embodiment is a non-aqueous coolant composition, which contains at least one amine compound as a non-aqueous base, and the amine compound is at least one selected from aliphatic amine compounds, aromatic amine compounds, alkanolamine compounds, amide amine compounds, amine oxide compounds, heterocyclic amine compounds, and ether amine compounds.

[0042] The non-aqueous coolant composition of the present embodiment has excellent insulation and improved heat transfer characteristics. In particular, the non-aqueous coolant composition of the present embodiment has excellent insulation, so even if the coolant leaks due to an accident, it can also suppress secondary disasters such as short circuits. In addition, the non-aqueous coolant composition of the present embodiment has improved heat transfer characteristics, so it has high cooling performance. Therefore, it can be well used in hybrid vehicles, electric vehicles, and other vehicles equipped with a driving motor.

[0043] As other effects of the non-aqueous coolant composition involved in this embodiment, the following aspects can be listed. Amine compounds, especially aliphatic amine compounds, have low ion solubility. Therefore, for the non-aqueous coolant composition involved in this embodiment, ions are difficult to dissolve from refrigerant pipes (such as rubber) used in cooling systems, and the increase in conductivity caused by long-term use is small. Therefore, the non-aqueous coolant composition involved in this embodiment can maintain excellent conductivity.

[0044] Other effects of the non-aqueous coolant composition of this embodiment include the following aspects. Conventionally, the commonly used ethylene glycol-based water-based coolant has excellent heat transfer properties but poor insulation. Figure 1 As shown in FIG. 1 , the part side of the cooling object needs to be set to an insulating structure. Specifically, Figure 1 As shown, an insulating plate ( Figure 1 6a, 6b) to ensure the insulation between the electronic device and the non-aqueous coolant composition. However, if an insulating plate is provided, the heat transfer characteristics between the non-aqueous coolant composition and the electronic device are reduced, and as a result, the cooling performance is reduced. The non-aqueous coolant composition involved in this embodiment has excellent insulation, so it is not necessary to provide an insulating plate, and as a result, a cooling system with excellent cooling performance can be provided.

[0045] As other effects of the non-aqueous coolant composition involved in the present embodiment, the following aspects can be cited. As an example of a cooling mechanism for an electronic device, there is a method in which the electronic device is at least partially (partially or completely) immersed in a non-aqueous coolant composition. For example, in order to cool, the power card can be configured by physical contact with the non-aqueous coolant composition. Although such a cooling structure has very excellent heat conduction efficiency, the electronic device is in direct contact with the non-aqueous coolant composition, so very excellent insulation is required for the non-aqueous coolant composition. The non-aqueous coolant composition involved in the present embodiment has very excellent insulation, is non-toxic, and is not prone to corrosion, so it can also be preferably used in a cooling system with such a cooling structure.

[0046] This embodiment is described in detail below.

[0047] 1. Non-aqueous coolant composition

[0048] The non-aqueous coolant composition involved in the present embodiment is a non-aqueous system. In this specification, non-aqueous means substantially free of water, and "substantially free of water" means that the non-aqueous coolant composition does not contain water in a content range that hinders the realization of the effect of the present embodiment, preferably, the content of water in the non-aqueous coolant composition is 1.0% by mass or less, more preferably, the content of water in the non-aqueous coolant composition is 0.5% by mass or less, more preferably, the content of water in the non-aqueous coolant composition is 0.1% by mass or less, and further preferably, the content of water in the non-aqueous coolant composition is 0.01% by mass or less, and more preferably, the content of water in the non-aqueous coolant composition is 0% by mass (cannot be detected).

[0049] The non-aqueous coolant composition involved in this embodiment contains at least one amine compound as a non-aqueous base, and the amine compound is at least one selected from aliphatic amine compounds, aromatic amine compounds, alkanolamine compounds, amide amine compounds, amine oxide compounds, heterocyclic amine compounds, and ether amine compounds. The amine compound preferably does not contain fluorine atoms. The amine compound has excellent insulation and heat transfer properties. The amine compound can be used alone or in combination of two or more.

[0050] In one embodiment, the amine compound is an aliphatic amine compound. The aliphatic amine compound has excellent insulation and heat transfer properties. In addition, the aliphatic amine compound has low ion dissolution, so it can suppress the dissolution of ions from refrigerant pipes (for example, rubber) and the like. As a result, the aliphatic amine compound can maintain excellent electrical conductivity.

[0051] The aliphatic amine compound may be either a saturated aliphatic amine compound or an unsaturated aliphatic amine compound. An unsaturated aliphatic amine compound contains at least one unsaturated bond. The aliphatic amine compound may be a primary amine, a secondary amine, or a tertiary amine. In the secondary amine and the tertiary amine, each hydrocarbon group is independent and may be the same or different. The hydrocarbon groups in the aliphatic amine compound are each independent and may be linear or branched. In addition, the number of carbon atoms of the hydrocarbon group in the aliphatic amine compound is, for example, 1 to 24, and preferably at least one hydrocarbon group has 6 to 24 carbon atoms. The aliphatic amine compound may be used alone or in combination of two or more.

[0052] In one embodiment, the aliphatic amine compound is NR 1 R 2 R 3 [Where R 1 C6~C 24 Alkyl, R 2 and R 3 Each independently represents a hydrogen atom or a C1-C4 alkyl group].1 Preferably, C8~C 20 Alkyl, C 10 ~C 18 Alkyl, C 12 ~C 16 Alkyl. In the formula, R 2 and R 3 Each is independent of the other, and preferably is a C1-C3 alkyl group, and is a C1-C2 alkyl group. In the formula, the alkyl group may be linear or branched.

[0053] Examples of the aliphatic amine include octylamine, nonylamine, decylamine, undecylamine, dodecylamine (laurylamine), tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine (stearylamine), and amines in which one or both of the two hydrogen atoms bonded to the nitrogen atom in these compounds are substituted with a methyl group or an ethyl group.

[0054] In one embodiment, the amine compound is an aromatic amine compound. Examples of the aromatic amine compound include aniline, benzylamine, meta-xylylenediamine, and diaminodiphenylmethane. The aromatic amine compound may be used alone or in combination of two or more.

[0055] In one embodiment, the amine compound is an alkanolamine compound. Examples of the alkanolamine compound include aminomethyl propanol, diethylene glycolamine, methanolamine, monoisopropanolamine, diethanolamine, diisopropanolamine, n-butylethanolamine, triethanolamine, or n-butyldiethanolamine. The alkanolamine compound may be used alone or in combination of two or more.

[0056] In one embodiment, the amine compound is an amidoamine compound. Examples of the amidoamine compound include stearamidopropyl dimethylamine, stearamidopropyl diethylamine, stearamidoethyl diethylamine, stearamidoethyl dimethylamine, and stearamidopropyl dimethylamine. The amidoamine compound may be used alone or in combination of two or more.

[0057] In one embodiment, the amine compound is an amine oxide compound. Examples of the amine oxide compound include lauryl dimethyl amine oxide and dodecane dimethyl amine oxide. The amine oxide compound may be used alone or in combination of two or more.

[0058] In one embodiment, the amine compound is a heterocyclic amine compound. Examples of the heterocyclic amine compound include pyridine and the like. The heterocyclic amine compound may be used alone or in combination of two or more.

[0059] In one embodiment, the amine compound is an etheramine compound. Examples of the etheramine compound include monoalkyl (C8-22) etheramines, etc. The etheramine compound may be used alone or in combination of two or more.

[0060] The melting point of the amine compound is preferably 0°C or lower, and -35°C or lower.

[0061] The molecular weight of the amine compound is preferably within a range of 120 to 300, within a range of 130 to 270, and within a range of 150 to 250. When the molecular weight of the amine compound is within the above range, the viscosity increase can be suppressed and the cooling property can be ensured.

[0062] The content of the amine compound in the non-aqueous coolant composition is, for example, 10% by mass or more, preferably 20% by mass or more, more preferably 30% by mass or more, further preferably 40% by mass or more, and further preferably 50% by mass or more. The more the content of the amine compound, the more the insulation and heat transfer properties of the non-aqueous coolant composition can be improved. The content of the amine compound in the non-aqueous coolant composition is, for example, 100% by mass or less, preferably 90% by mass or less. The content of the amine compound in the non-aqueous coolant composition may be 100% by mass.

[0063] The non-aqueous coolant composition involved in this embodiment may also contain other non-aqueous bases in addition to the above-mentioned amine compounds. Other non-aqueous bases are preferably at least one base oil selected from mineral oil and synthetic oil. That is, in one embodiment, in the non-aqueous coolant composition, as a non-aqueous base, in addition to the above-mentioned amine compounds, at least one base oil selected from mineral oil and synthetic oil is contained. By selecting the base oil as the other non-aqueous base, the insulation of the non-aqueous coolant composition can be improved. In addition, the base oil is highly compatible with the amine compound, and even if mixed, it is not easy to produce problems such as phase separation. Therefore, the non-aqueous coolant composition containing the amine compound and the base oil is a coolant with high insulation and good stability as a liquid composition. As mineral oil, for example, paraffin mineral oil, cycloalkane mineral oil, or a mixture thereof can be listed. As synthetic oil, for example, ester synthetic oil, synthetic hydrocarbon oil, silicone oil, fluorinated oil, or a mixture thereof can be listed. As a base oil, one can be used alone or two or more can be mixed for use.

[0064] The kinematic viscosity (40°C) of the base oil is not particularly limited, but is, for example, 0.5 to 100 mm 2 / s, preferably 0.5 to 20 mm 2 / s, more preferably 0.5 to 10 mm 2 / s.

[0065] The content of the base oil in the non-aqueous coolant composition is preferably 10% by mass or more, preferably 20% by mass or more, preferably 30% by mass or more, preferably 40% by mass or more, and preferably 50% by mass or more.

[0066] When the non-aqueous coolant composition contains a base oil, the content of the amine compound in the non-aqueous coolant composition is preferably 10 to 90% by mass, and the content of the base oil in the non-aqueous coolant composition is preferably 10 to 90% by mass. When the non-aqueous coolant composition contains a base oil, the content of the amine compound in the non-aqueous coolant composition is preferably 30 to 70% by mass, and the content of the base oil in the non-aqueous coolant composition is preferably 30 to 70% by mass. When the non-aqueous coolant composition contains a base oil, the content of the amine compound in the non-aqueous coolant composition is preferably 40 to 60% by mass, and the content of the base oil in the non-aqueous coolant composition is preferably 40 to 60% by mass.

[0067] When the non-aqueous coolant composition contains a base oil, the total content of the amine compound and the base oil is preferably 80 mass % or more, more preferably 85 mass % or more, further preferably 90 mass % or more, further preferably 95 mass % or more, further preferably 98 mass % or more, and most preferably 100 mass %.

[0068] The non-aqueous coolant composition of the present embodiment may contain, in addition to the above-mentioned components, an antioxidant, a rust inhibitor, a friction modifier, a corrosion inhibitor, a viscosity index improver, a pour point depressant, a dispersant / surfactant, an anti-wear agent, or a solid lubricant, etc. The content of the additive in the non-aqueous coolant composition is, for example, 0.1 to 20% by mass, preferably 10% by mass or less, preferably 5% by mass or less, and preferably 1% by mass or less.

[0069] The non-aqueous coolant composition according to the present embodiment has a kinematic viscosity (20° C.) of, for example, 0.1 to 100 mm 2 / s, preferably 0.1 to 10 mm 2 / s.

[0070] Since the non-aqueous coolant composition is forcibly circulated in the cooling system, a composition with low viscosity is preferred. The viscosity of the non-aqueous coolant composition can be adjusted, for example, by the viscosity and amount of the added base oil. The kinematic viscosity (40°C) of the non-aqueous coolant composition of this embodiment is preferably 0.1 to 10 mm 2 / s.

[0071] The electrical conductivity (20° C.) of the nonaqueous coolant composition according to the present embodiment is preferably 0.1 μS / cm or less, preferably 0.01 μS / cm or less, and more preferably 0.001 μS / cm or less.

[0072] 2. Cooling system

[0073] The non-aqueous coolant composition involved in the present embodiment is used for a cooling system, preferably for a cooling system of a car with a travel motor. That is, one scheme of the present embodiment is a cooling system using the non-aqueous coolant composition involved in the present embodiment as a refrigerant. In addition, one scheme of the present embodiment is a cooling system for cooling a heat generating device mounted on a car with a travel motor. In addition, one scheme of the present embodiment is a car with a travel motor having a cooling system involved in the present embodiment and a heat generating device cooled by the cooling system.

[0074] In this specification, the term "vehicle with a running motor" includes an electric vehicle that has no engine but only a running motor as a power source, and a hybrid vehicle that has both a running motor and an engine as power sources. In addition, a fuel cell vehicle is also included in the category of "vehicle with a running motor".

[0075] As one of the countermeasures to environmental problems, hybrid vehicles, fuel cell vehicles, electric vehicles, etc. that use the driving force of the motor to travel have attracted attention. In such a car, heat-generating devices such as motors, generators, inverters, converters, and batteries generate heat to high temperatures, so it is necessary to cool these heat-generating devices. As described above, the non-aqueous coolant composition involved in the present embodiment has both excellent insulation and heat transfer properties. Even in the case of leakage of the non-aqueous coolant composition due to accidents, it is difficult to cause secondary disasters such as short circuits, and in addition, the cooling performance is excellent. Therefore, it can be used well in the cooling system of a car with a driving motor.

[0076] The cooling system includes, for example, a refrigerant pipe in which a non-aqueous coolant composition as a refrigerant flows, a liquid storage tank for accommodating the non-aqueous coolant composition, a circulation device for circulating the non-aqueous coolant composition in a circulation path, or a cooling device for reducing the temperature of the non-aqueous coolant composition. As the circulation device, for example, an electric pump can be listed. As the cooling device, for example, a radiator, a cooler or an oil cooler can be listed. The cooling object of the cooling system is a heat generating device such as an inverter, a converter, a generator, a motor or a battery.

[0077] The configuration of the cooling system is not particularly limited. The cooling system includes, for example, a refrigerant pipe, a liquid storage tank, an electric pump, a radiator, and a cooling unit provided by the heat generating device. The cooling unit is a part that receives heat generated by the heat generating device, for example, Figure 1The cooler 3 is equivalent to the cooling unit. For example, after the non-aqueous coolant composition is pumped out from the liquid storage tank by an electric pump, the heat generating device is cooled by the cooling unit, and then the non-aqueous coolant composition is returned to the liquid storage tank via the downstream radiator. Since the temperature of the non-aqueous coolant composition after cooling the cooling unit increases, the temperature of the non-aqueous coolant composition with increased temperature is lowered by the radiator. In addition, an oil cooler may be arranged in the middle of the refrigerant pipe, and the motor may be cooled by the oil cooler.

[0078] The cooling system of this embodiment is preferably used in a car with a driving motor. That is, one embodiment of this embodiment is a car with a driving motor equipped with the cooling system of this embodiment. In addition, one embodiment of this embodiment is an electric car, a hybrid car, or a fuel cell car equipped with the cooling system of this embodiment.

[0079] In addition, as described above, the non-aqueous coolant composition involved in the present embodiment has excellent insulation, is non-toxic, and is not prone to corrosion, so it can be well used in a cooling system having a cooling structure that makes an electronic device at least partially (partially or completely) immersed in a non-aqueous coolant composition. As an electronic device, a power card or a CPU with a built-in semiconductor element can be listed. The specific mode of such a cooling system can be seen, for example, in U.S. Patent No. 7,403,392 or U.S. Patent Application Publication No. 2011 / 0132579. Specifically, one scheme of the present embodiment is that a heating device has a power card, and a car with a driving motor that the non-aqueous coolant composition is in physical contact with the power card.

[0080] [Example]

[0081] The present embodiment will be described below with reference to examples, but the present invention is not limited to these examples.

[0082] <Materials>

[0083] ·N,N-Dimethyldecylamine (produced by Tokyo Chemical Industry Co., Ltd.)

[0084] ·N,N-Dimethyldodecylamine (produced by Tokyo Chemical Industry Co., Ltd.)

[0085] ·3-Aminotrifluorotoluene (produced by Tokyo Chemical Industry Co., Ltd.)

[0086] Mineral oil: Kinematic viscosity (20°C) 0.1~10mm 2 / s

[0087] ·Previous LLC( Genuine, trade name: スーパーロングライフクーラント, contains ethylene glycol and additives. )

[0088] · Ethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.) (hereinafter also referred to as EG.)

[0089] Ion exchange water

[0090] <Preparation method>

[0091] Each non-aqueous coolant composition was prepared using the compositions described in Tables 1 and 2 below.

[0092] <Electrical conductivity>

[0093] The electrical conductivity of each non-aqueous coolant composition at 20° C. was measured using a conductivity meter (manufactured by Yokogawa Electric Corporation, The results are shown in Tables 1 and 2.

[0094] <Heat transfer characteristics>

[0095] Regarding the heat transfer characteristics of each non-aqueous coolant composition, the cooling performance of a radiator using each non-aqueous coolant composition as a refrigerant was calculated using the following formula for comparison. The results are shown in Tables 1 and 2.

[0096] Specifically, the cooling performance of the radiator using each non-aqueous coolant composition as the refrigerant was calculated using the following formula. The refrigerant was adjusted so that the inlet temperature was 65°C. The other conditions were as follows. Air flow to the radiator: 4.5 m / sec, refrigerant flow rate: 10 L / min, temperature difference between the refrigerant and the outside air: 40°C (refrigerant: 65°C, outside air: 25°C).

[0097]

[0098] Q W : Cooling performance, V W : Refrigerant flow rate, γ W : Density of refrigerant, C PW : Specific heat of refrigerant, t W1 : Refrigerant inlet temperature, t W2 : Refrigerant outlet temperature

[0099] <Compatibility>

[0100] In order to confirm the compatibility of the amine compound with the mineral oil, each non-aqueous coolant composition of Examples 3 to 6 and Comparative Example 5 was placed in a beaker, stirred at room temperature for 5 minutes using a stirrer, and then left to stand for 24 hours. Thereafter, the presence or absence of phase separation was observed. The results are shown in Tables 1 and 2. In addition, in Tables 1 and 2, the case where no phase separation occurred is indicated by ○, and the case where phase separation occurred is indicated by ×.

[0101] Table 1

[0102]

[0103] Table 2

[0104]

[0105] It can be confirmed that the electrical conductivity of the non-aqueous coolant composition of any example is less than 0.0009 μS / cm, and has excellent insulation. In addition, the cooling performance of the non-aqueous coolant composition of any example is higher than that of mineral oil (Comparative Example 3), and has improved heat transfer characteristics. In particular, as the content of the amine compound increases, the cooling performance improves.

[0106] On the other hand, in Comparative Examples 1, 2, and 4 having the conventional non-aqueous coolant composition (a mixture of ethylene glycol and water or water alone), the conductivity was high and the insulation was insufficient. In Comparative Example 5 using 3-aminobenzotrifluoromethane, 3-aminobenzotrifluoromethane and mineral oil phase-separated, and a uniform liquid composition could not be obtained.

[0107] The above results confirm that the non-aqueous coolant composition according to the present embodiment has excellent insulation properties and improved heat transfer characteristics.

[0108] Unless otherwise specified, the terms used in this specification should be understood to have the meanings commonly used in the art. Therefore, unless otherwise defined, all technical terms and scientific and technical terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs. In the event of a conflict, this specification (including definitions) takes precedence.

[0109] Throughout this specification, singular expressions should be understood to include the concept of plural forms unless otherwise specified. Therefore, singular articles (e.g., "a", "an", "the", etc. in English) should be understood to include the concept of plural forms unless otherwise specified.

[0110] The upper limit and / or lower limit of the numerical range described in this specification can be arbitrarily combined to define a preferred range. For example, the upper limit and lower limit of the numerical range can be arbitrarily combined to define a preferred range, the upper limits of the numerical range can be arbitrarily combined to define a preferred range, and the lower limits of the numerical range can be arbitrarily combined to define a preferred range.

[0111] Although the present embodiment has been described in detail above, the specific configuration of the present invention is not limited to the embodiment, and any design changes that do not depart from the gist of the present invention are included in the present invention.

Claims

1. A non-aqueous coolant composition comprising at least one NR 1 R 2 R 3 The amine compound shown is used as a non-aqueous base. In the above formula, R 1 C6~C 24 Alkyl, R 2 and R 3 Each is independently a C1-C3 alkyl group, The composition further contains at least one base oil selected from mineral oil and synthetic oil, wherein the content of the base oil is 10 mass % or more, and the total content of the amine compound and the base oil is 80 to 100 mass %.

2. The non-aqueous coolant composition according to claim 1, wherein The electrical conductivity at 20°C is less than 0.1 μS / cm.

3. A cooling system using the non-aqueous coolant composition according to claim 1 or 2 as a refrigerant.

4. The cooling system according to claim 3, which is used to cool a heat-generating device mounted on a vehicle having a driving motor.

5. The cooling system according to claim 4, wherein: The heat generating device is an inverter, converter, generator, motor or battery.

6. The cooling system according to claim 4 or 5, wherein: The heat generating device has a power card, and the coolant composition is in physical contact with the power card.

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